| 摘要 |
PURPOSE:To improve the quality of a casting by using an expendable pattern to manufacture a ceramic shell then preparing a backup mold and removing the pattern. CONSTITUTION:A slurry is coated on an expendable pattern 1 to a prescribed thickness to manufacture a ceramic shell 4. When substantial strength is obtd. upon curing of the shell 4, a molding flask 5 is set and a backup mold 6 is packed therein. After the mold 6 cures, the mold is dried at a prescribed atmosphere temp. and at the same time the pattern 1 is expended. The material constituting the pattern 1 is removed through a sprue 2 or flow-off 3 is this stage, by which a casting mold having the dry shell 4 of a monolithic type having no seams is completed. |
